Faced with World Cup winner Luca Toni and Germany striker Lukas Podolski, as well as his international team-mate Miroslav Klose in the second half, Diamond showed no sign of nerves.
"I thought he was fabulous," said Calderwood after his side lost their last-32 clash 7-3 on aggregate. "He has really grown up and Zander was by far the best player on the field."
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